Hydraulic manual device

ABSTRACT

A manual hydraulic apparatus (1) with a traction/pressure installation, for example, a hole punch apparatus, with a hydraulic piston (5) which can be moved with respect to a cylindrical housing (25), and with a holding-up part (2) and a fastening installation (3), for example, for a piercing punch. The fastening installation (3) is rigidly connected to the cylindrical housing (25) and the holding-up part (2) can be moved by the hydraulic piston (5) with respect to the fastening installation (3).

BACKGROUND

The invention relates to a manual hydraulic apparatus with atraction/pressure installation, for example, a hole punch apparatus,with a hydraulic piston which can e moved with respect to a cylindricalhousing, and with a holding-up part and a fastening installation, forexample, for a piercing punch.

Different variants of such manual hydraulic apparatuses are alreadyknown. One such manual apparatus cannot only be used as a transportableperforation apparatus, for example, for the punching of holes in metalsheets, it can also, in another variant, be used as a blind rivetingapparatus. With regard to the latter possibility, reference is made, forexample, to the state of the prior art according to EP B1 62 206.

In the known manual hydraulic apparatuses, the design of thetraction/pressure installation is not yet considered to be satisfactory.

The hydraulic piston of the known manual hydraulic apparatus retracts,when pressure is applied, pulling the piercing punch to the apparatus,while the holding-up part remains fixed. Accordingly, the admission ofthe hydraulic piston must be from the front. Because, in addition, thehydraulic piston is still connected to the fastening installation, onlya ring surface of the piston is available for the admission pressure.This surface must have the appropriate area, or a correspondingly highhydraulic pressure must be applied.

SUMMARY

Starting from the state of the art described above, the inventionconcerns the technical problem of improving and simplifying, to theextent possible, the known manual hydraulic apparatus, particularly withregard to its construction.

This technical problem may be solved by one aspect of the presentinvention, where it is assumed that the fastening installation isrigidly connected to the cylindrical housing and that the holding-uppart can be moved by the hydraulic piston with respect to the fasteninginstallation.

In this context, a rigid connection with the fastening installation ofthe housing itself is crucial. In any case, the fastening installationis here also directly connected to the fixed cylindrical housing.According to the invention, an exchange is made between the movable andfixed part of the drive installation. It was recognized that, incontrast to the principle used so far in such an apparatus, theholding-up part can be actively moved, that is the manual hydraulicapparatus, when used, can be braced against one of the surfaces of theholding-up part, whereas the fastening installation remains fixed. Thisexchange between the movable and the fixed part makes it possible to usea considerably simpler construction design. The hydraulic piston, whenactuated, can receive the admission pressure from the floor. The entirepiston surface can be available for this purpose. Since admissionpressure need not be applied to the top of the hydraulic pistons, thatis the side pointing in the direction of the holding-up part, the designof the apparatus can, as a result, be much more compact. In anadditional advantageous variant, the invention provides for a design ofthe holding-up part which is essentially in the shape of a circularring. The fastening installation can, to the extent compatible with theknown variant, be in a position which is central with respect to theholding-up part. For this purpose it is particularly preferred that theholding-up part passes through the fastening installation. Thus it ispossible, in a simple manner, to apply the admission pressure onto theholding-up part by means of the hydraulic piston in spite of the centralarrangement of the fastening installation. In greater detail, thehydraulic piston can, for this purpose, pass through the fasteninginstallation by means of pressure rods, which act on the holding-uppart. To hold the holding-up part together with a hydraulic piston,other separate screw connections are listed below. Moreover, it is alsopossible for the pressure rods, if they are properly designed, to takeover the task of fastening the parts to each other. In addition, it ispreferred that the hydraulic piston is braced by a spring connection tothe fastening installation in its resting position. It is sufficient toinsert a simple pressure spring between the top side of the hydraulicpiston and the bottom side of the fastening installation. Furthermore, aconcrete variant also provides, as already discussed in principle, forthe possibility of applying admission pressure essentially over theentire surface area of the cross section of the hydraulic piston.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is explained below with reference to the drawing in theappendix, which, however, represents only one embodiment example. Thefigures show:

FIG. 1, a cross-sectional representation of the principle of a manualhydraulic apparatus designed as a metal sheet punching apparatus.

FIG. 2, a cross section through the piston/holding-up part of anapparatus according to FIG. 1, in an alternate embodiment;

FIG. 3, a view according to FIG. 2, in actuated position;

FIG. 4, a cross section through the object according to FIG. 2, cutalong line IV--IV;

FIG. 5, a representation according to FIG. 2, in an additional alternateembodiment;

FIG. 6, a representation of the object according to FIG. 5, in theactuated state.

DESCRIPTION

The representation and description refer, first with respect to FIG. 1,to a manual hydraulic apparatus 1, with a holding-up part 2 and afastening installation 3. The fastening installation 3 has an internalthreading 4, in which a piercing punch is to be attached in theapparatus according to the embodiment example, which is a metal sheetpiercing apparatus.

The holding-up part 2 can be moved with respect to the fasteninginstallation 3, that is it is arranged so it can be moved out. Thefastening installation 3, in contrast, should be attached rigidly to ahousing 6 of the manual apparatus, specifically by means of acylindrical housing 25 for a hydraulic piston 5; in the embodimentexample, by means of a threading 7 and setting screws 8.

To move the holding-up part 2, the admission pressure is applied to itfrom the mentioned hydraulic piston 5, which in turn is braced by meansof a pressure spring 9 against a bottom side 10 of the fixed holding-uppart 3 in its rest position, as represented.

For the admission pressure applied to the hydraulic piston 5, ahydraulic reserve is stored in a container 11 in the manual apparatus 1.The application of pressure occurs, in detail, by means of a pump slide13 which is driven by an electronic motor 12. The drive occurs by meansof a cam 15 which is radially attached to the motor shaft 14. The cam 15works in cooperation with a ball bearing, where the internal ring 16 ofthe ball bearing is rigidly connected to the cam, whereas the externalring 17 acts on a bottom side 18 of the pump slide 13. The pump slide 13is clamped in its bottom position by a pressure spring 19.

In addition, with regard to the design of such a drive, reference isalso made to U.S. Pat. Nos. 5,111,681 and 5,195,354. The hydraulicpiston 5 possesses, in further detail, a top piston surface 20, againstwhich slide rods 21 are applied, which act on the holding-up part 2. Theslide rods 21, with their other ends, are applied against a bottomsurface 22 of the holding-up part 2, which is here essentially in theshape of a circular ring.

The holding-up part 2, which is shifted by an angle with respect to theslide rods 21, is rigidly connected to the hydraulic piston 5 by meansof holding screws 23.

The fastening screws 23 are, in detail, connected to a ring flange 24 ofthe hydraulic piston. The ring flange 24 extends in part over thecylindrical housing 25 which is designed so it forms an integral partwith the apparatus.

The cylindrical housing 25, on the side of the holding-up part, has anexternal threading 7, by means of which the fastening installation 3 isconnected to the hydraulic apparatus by a screw connection. Accordingly,the fastening installation 3, on the cylindrical housing side, is alsodesigned in the shape of a cylinder, whereas, on the side of theholding-up part, a cylindrical floor or a holding plate is provided. Thecylindrical floor is accessible, on the one hand, from the outside bymeans of a design in the form of a fastening opening with internalthreading 4, and it is provided, on the other hand, with passageopenings 26, 27 for the slide rods 21 or fastening screws 23. This canalso be seen in the cross-sectional representation according to FIG. 4,to which further reference will be made below. In the embodimentexample, at an equidistant angular spacing, three slide rods 21 andthree fastening screws 23 are provided.

In FIGS. 2-4, an embodiment variant is represented which differs withregard to the holding-up part. Here the holding-up part is connected bymeans of an internal threading 28 to the cylindrical housing 25 on theholding-up part side of the cylindrical housing. Furthermore, theholding-up part 2, according to the embodiment variant of FIGS. 2-4,forms an external cover wall 29, which projects in the shape of acylinder on the side of the housing. The cover wall 29, in theembodiment example, moves outside on the cylindrical housing 25 when theholding-up part receives an actuating stroke. In FIG. 3, the actuatedposition is represented. Thus, a maximum use is obtained with respect tothe external diameter for the holding-up part surface is obtained.

It is apparent from the cross-sectional representation according to FIG.4 that, and in this regard in agreement with the embodiment variant ofFIG. 1, both the slide rods 21 and the fastening screws 23 pass throughan external part of the fastening installation 3.

FIGS. 5 and 6 represent an additional modification of the embodimentvariant of FIG. 1, and FIGS. 3-4, respectively.

Here there is agreement with the embodiment variant of FIGS. 2-4, exceptthat the apron area 29 is omitted. Instead, the movable holding-up part2, in agreement in this regard with the embodiment variant of FIG. 1,passes, in a variant in the shape of a circular ring, through a topclosing surface 30 of the fastening installation 3.

All the embodiment variants share the feature that the hydraulic piston5 receives the admission pressure during the working stroke from thehydraulic means, in a direction pointing away from the manual apparatus1, and over the entire area of the (lower) cross-sectional surface 31.

All the disclosed characteristics are essential to the invention. Theentire contents of the disclosures of the related/enclosed prioritydocuments (copy of the preliminary application) are hereby included inthe disclosure of the application, including for the purpose ofincluding characteristics of these documents in claims of the presentapplication.

I claim:
 1. A manual hydraulic apparatus comprising: a housing; ahydraulic piston which can be moved with respect to said housing; aholding-up part; and a fastening installation rigidly connected to saidhousing, wherein said holding-up part can be moved by said hydraulicpiston with respect to said fastening installation, wherein saidhydraulic piston acts by means of pressure means which pass through saidfastening installation on the holding-up part.
 2. A manual hydraulicapparatus according to claim 1, said holding-up part comprising acircular ring.
 3. A manual hydraulic apparatus according to claim 1,wherein said fastening installation is arranged in a central positionwith respect to said holding-up part.
 4. A manual hydraulic apparatusaccording to claim 1, wherein said holding-up part passes through saidfastening installation.
 5. A manual hydraulic apparatus according toclaim 1, said holding-up part being connected to said hydraulic pistonby a screw connection.
 6. A manual hydraulic apparatus according toclaim 1, said hydraulic piston being braced by means of a spring againstsaid fastening installation in a rest position.
 7. A manual hydraulicapparatus according to claim 1, wherein said hydraulic piston canreceive an admission force essentially over its entire cross-sectionalarea.
 8. A manual hydraulic apparatus according to claim 1, wherein saidpressure means comprises pressure rods.
 9. A manual hydraulic apparatuscomprising: a housing; a hydraulic piston which can be moved withrespect to said housing; a holding-up part; and a fastening installationrigidly connected to said housing, wherein said holding-up part can bemoved by said hydraulic piston with respect to said fasteninginstallation, wherein said fastening installation is arranged in acentral position with respect to said holding-up part.
 10. A manualhydraulic apparatus according to claim 9, said holding-up partcomprising a circular ring.
 11. A manual hydraulic apparatus accordingto claim 9, wherein said holding-up part passes through said fasteninginstallation.
 12. A manual hydraulic apparatus according to claim 9,wherein said hydraulic piston acts by means of pressure means which passthrough said fastening installation on the holding up part.
 13. A manualhydraulic apparatus according to claim 9, said holding-up part beingconnected to said hydraulic piston by a screw connection.
 14. A manualhydraulic apparatus according to claim 9, said hydraulic piston beingbraced by means of a spring against said fastening installation in arest position.
 15. A manual hydraulic apparatus according to claim 9,wherein said hydraulic piston can receive an admission force essentiallyover its entire cross-sectional area.
 16. A manual hydraulic apparatusaccording to claim 9, wherein said pressure means comprises pressurerods.
 17. A manual hydraulic apparatus comprising: a housing; ahydraulic piston which can be moved with respect to said housing; aholding-up part; and a fastening installation rigidly connected to saidhousing, wherein said holding-up part can be moved by said hydraulicpiston with respect to said fastening installation, said holding-up partbeing connected to said hydraulic piston by a screw connection.
 18. Amanual hydraulic apparatus according to claim 17, said holding-up partcomprising a circular ring.
 19. A manual hydraulic apparatus accordingto claim 17, wherein said fastening installation is arranged in acentral position with respect to said holding-up part.
 20. A manualhydraulic apparatus according to claim 17, wherein said holding-up partpasses through said fastening installation.
 21. A manual hydraulicapparatus according to claim 17, wherein said hydraulic piston acts bymeans of pressure means which pass through said fastening installationon the holding up part.
 22. A manual hydraulic apparatus according toclaim 17, said hydraulic piston being braced by means of a springagainst said fastening installation in a rest position.
 23. A manualhydraulic apparatus according to claim 17, wherein said hydraulic pistoncan receive an admission force essentially over its entirecross-sectional area.
 24. A manual hydraulic apparatus according toclaim 17, wherein said pressure means comprises pressure rods.